DrawGetVectorGraphics + DrawSetVectorGraphics
Posted: 2015-06-03T04:34:39-07:00
Hi,
Not sure if this is a bug, or just weird behaviour. It seems the output of DrawGetVectorGraphics cannot be used as the input for DrawSetVectorGraphics. Instead the text returned must be wrapped with a root node i.e. :
Please could you either i) say that this behaviour is intentional, and will stay like this forever ii) classify it as a bug and fix it?
cheer
Dan
Full code to reproduce:
Not sure if this is a bug, or just weird behaviour. It seems the output of DrawGetVectorGraphics cannot be used as the input for DrawSetVectorGraphics. Instead the text returned must be wrapped with a root node i.e. :
Code: Select all
vector = DrawGetVectorGraphics(drawing_wand_src);
sprintf(encapsulatedGraphics, "<root>%s</root>", vector);
status = DrawSetVectorGraphics(drawing_wand_dst, encapsulatedGraphics);
cheer
Dan
Full code to reproduce:
Code: Select all
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wand/MagickWand.h>
void ThrowWandException(MagickWand *wand) {
char *description;
ExceptionType severity;
description = MagickGetException(wand, &severity);
printf("description is %s \n", description);
(void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description);
description=(char *) MagickRelinquishMemory(description);
exit(-1);
}
PixelWand *makePixelWand(char *string) {
PixelWand *pixel_wand;
pixel_wand = NewPixelWand();
if (PixelSetColor (pixel_wand, string) == MagickFalse) {
printf("Failed to set color");
exit(-1);
}
return pixel_wand;
}
int main(int argc,char **argv) {
PixelWand *stroke_color_wand;
PixelWand *fill_color_wand;
PixelWand *background_color_wand;
MagickBooleanType status;
DrawingWand *drawing_wand_src;
DrawingWand *drawing_wand_dst;
char *filename = "vector.png";
char *vector;
char encapsulatedGraphics[4096];
MagickWandGenesis();
drawing_wand_src = NewDrawingWand();
stroke_color_wand = makePixelWand("red");
fill_color_wand = makePixelWand("blue");
DrawSetStrokeColor(drawing_wand_src, stroke_color_wand);
DrawSetFillColor(drawing_wand_src, fill_color_wand);
DrawCircle(drawing_wand_src, 50, 50, 100, 100);
vector = DrawGetVectorGraphics(drawing_wand_src);
drawing_wand_dst = NewDrawingWand();
//This should work, but doesn't
//status = DrawSetVectorGraphics(drawing_wand_dst, vector);
//This works, but isn't documented as needed.
sprintf(encapsulatedGraphics, "<root>%s</root>", vector);
status = DrawSetVectorGraphics(drawing_wand_dst, encapsulatedGraphics);
if (status == MagickFalse) {
printf("DrawSetVectorGraphics failed.\n");
return(-1);
}
else {
printf("DrawSetVectorGraphics succeeded.\n");
}
MagickWand *magick_wand;
magick_wand = NewMagickWand();
background_color_wand = makePixelWand("white");
status = MagickNewImage(magick_wand, 500, 500, background_color_wand);
MagickSetImageFormat(magick_wand, "png");
status = MagickDrawImage(magick_wand, drawing_wand_dst);
if (status == MagickFalse) {
ThrowWandException(magick_wand);
}
status = MagickWriteImages(magick_wand, filename, MagickTrue);
if (status == MagickFalse) {
ThrowWandException(magick_wand);
}
MagickWandTerminus();
return (0);
}